push or pull

[Azurite]

Hello. I'm building a big water cooling system and i am using two quad radiators for 120mm fans. I am planing on using fans on both sides, but i might start with 4 fans on each radiator for starters. Should i set the fans to push air trough or pull? any of you measured any big temperature difference between those two options?

 

[Bungral]

There isn't a massive difference at all from what I've read and experienced.

I've used both methods with little difference between the two.

 

[dugdiamond]

push - the airspeed is greatest leaving the fans

 

[SnW]

push and PULL

 

[Karlos_the_n00b]

Push, because you can mount filters on the fans then meaning less dust is pushed through your rad or onto it?

Never done any water cooling so its just a untested thought. Suppose you could put filters over the rad anyway in a pull method but with push it could be simpler.

Dugdiamond's point makes a lot of sense to me too.

 

[Firat]

There isn't a massive difference at all from what I've read and experienced.

I've used both methods with little difference between the two.

whats is your temps on load?

 

[Azurite]

Push, because you can mount filters on the fans then meaning less dust is pushed through your rad or onto it?

Never done any water cooling so its just a untested thought. Suppose you could put filters over the rad anyway in a pull method but with push it could be simpler.

Dugdiamond's point makes a lot of sense to me too.

Its exaust, so no filters on the fans. Will clean the radiator with air compressor regularly.

Looks like i must measure this myself, but i think it will be pull because normally it will be less noise(does that on the H70). On 8 fpi rad it might be no difference at all.

 

[Bungral]

On my current rig?

At present it's set up as push and the load temps are (depending on my room temperature) between 60 - 67

whats is your temps on load?

 

[Karlos_the_n00b]

Its exaust, so no filters on the fans. Will clean the radiator with air compressor regularly.

Looks like i must measure this myself, but i think it will be pull because normally it will be less noise(does that on the H70). On 8 fpi rad it might be no difference at all.

Ofc. Sorry, didn't even cross my mind that it might be fitted as an exhaust.

I suppose that by fitting it in the manner you are suggesting that the radiator would muffle some of the sound from the fans.

 

[adamjamesroe]

Push

 

[FlightSimDude]

push/pull. A slightly lower fan rpm on the push side to eliminate turbulence between the two fans.

 

[tinytomlogan]

push - the airspeed is greatest leaving the fans

Wrong. the airspeed would be the same either way, same fan same rad will be same temps. Only difference is pull is slightly quieter if you want to be anal about it.

 

[SmoulderingCircuits]

Wrong. the airspeed would be the same either way, same fan same rad will be same temps. Only difference is pull is slightly quieter if you want to be anal about it.

Tom's word of the month.

To add to the insanity, it would be louder inside as the minute pulses would rattle the case to produce nano decibels of noise, which could potentially damage the cpu over a approximate 53,000 million year period. Very dangerous. I would recommend running your fan in zero gravity with a babboon 3 metres away to thicken the air when it farts, reducing turbulence

In other words, it makes no difference!

 

[dugdiamond]

lick the back of your hand.

suck the air from just above

now... lick the back of the other hand, but, blow on it

which was colder?

 

[SmoulderingCircuits]

lick the back of your hand.

suck the air from just above

now... lick the back of the other hand, but, blow on it

which was colder?

If your case temps are 37*c something is wrong!

 

[Bungral]

That's just because you as a human can't invert your lips to make the comparison equal.

Also, when you're breating in off your hand, you're just sucking air from around it but when you blow on it, you're forcing air on to your hand.

It's not a very good analogy is what I'm getting at

lick the back of your hand.

suck the air from just above

now... lick the back of the other hand, but, blow on it

which was colder?

 

[SmoulderingCircuits]

That's just because you as a human can't invert your lips to make the comparison equal.

Also, when you're breating in off your hand, you're just sucking air from around it but when you blow on it, you're forcing air on to your hand.

It's not a very good analogy is what I'm getting at

I don't think it was supposed to be

 

[hmmblah]

lick the back of your hand.

suck the air from just above

now... lick the back of the other hand, but, blow on it

which was colder?

Think of air almost like water. If you have a hose pumping water into a bucket and you cut off the source of the water, does the bucket still fill up?

With a fan the same amount of air has to go into the fan to push the air out. A fan doesn't create air.

 

[jonowee]

Since you're pulling/pushing air through a constriction (the radiator), it will still be the the same volume of air. Then thrown in the fan's static pressure performance to be able to push/pull air through the constriction of the radiator.

If it were a fan in the open, then the air is thrown out faster at a more concentrated cone or column than the air being pulled in at all angles.

Just go with what's easier to mount tidily.

 

[dugdiamond]

i'm glad someone sees my point